When Naevia is with Lucretia, she is wearing her tunic over only one breast, with a thin strap covering the other one. When she has her meeting with Crixus, the tunic has changed to cover both breasts.
Dominus tells Spartacus he made a mistake approaching his felled sparring partner to which Spartacus replies it would be a difficult feat from his backside. He appears to have forgotten he struck his first killing blow in the arena when he had been knocked to the ground.